Is it possible to post a description/comment variable to the facebook sharer url? It's only possible for url and title as far as I can figure out.
UPDATE:
Quotes/Comments were decommissioned from Facebook Sharer URLs in mid 2022.
As shown, title contains the preview title, description contains the preview summary and image_src contains the preview image. Please make sure that none of the content fields contain any html markup because it will be stripped out. For consistency's sake, please use the <meta> tag to provide text data for the preview, and the <link> tag for any source urls.